Green Mold Growing on South Side of House

I have a single story ranch-style house with white vinyl siding. My house faces east and gets very little sunlight on side facing south. A few years ago the next door neighbor painted his twp-story house red. Green mold has rapidly grown completely over the south facing side of my house. When the sun is shining the neighbor’s red house casts a pink-ish haze over the south side of my house. What is the best way to remove this green mold from my house. Also is there any way to prevent the mold from rapidly coming back.